CN100505746C - Method for implement virtual leased line - Google Patents

Method for implement virtual leased line Download PDF

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CN100505746C
CN100505746C CN 200410004119 CN200410004119A CN100505746C CN 100505746 C CN100505746 C CN 100505746C CN 200410004119 CN200410004119 CN 200410004119 CN 200410004119 A CN200410004119 A CN 200410004119A CN 100505746 C CN100505746 C CN 100505746C
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virtual
vlan
local area
area network
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CN1652542A (en
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斌 李
李德丰
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/46Interconnection of networks
    • H04L12/4633Interconnection of networks using encapsulation techniques, e.g. tunneling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/46Interconnection of networks
    • H04L12/4641Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4645Details on frame tagging
    • H04L12/465Details on frame tagging wherein a single frame includes a plurality of VLAN tags
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/70Admission control or resource allocation
    • H04L47/72Reservation actions
    • H04L47/724Reservation actions involving intermediate nodes, e.g. RSVP
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/70Admission control or resource allocation
    • H04L47/82Miscellaneous aspects
    • H04L47/825Involving tunnels, e.g. MPLS

Abstract

本发明涉及虚拟专用网的实现,公开了一种实现虚拟租用线的方法,使得能够充分利用现有设备,在封装简单、开销较小的同时又能实现自动配置并保证流量工程等方面的要求。 The present invention relates to virtual private networks, discloses a method for implementing a virtual leased line, enabling full use of existing equipment, and can be automatically configured in a simple package, while a small overhead and to ensure the traffic engineering requirements . 这种实现虚拟租用线的方法包含以下步骤:A.利用虚拟局域网双标签技术实现虚拟局域网标签栈;B.使动态虚拟局域网双标签交换设备和其它标准多协议标签交换设备实现互通;C.扩展标签分配协议以分发虚拟局域网标签并作为二层虚拟专用网的拓扑发现协议;D.扩展资源预留协议-流量工程分配虚拟局域网标签并协商虚拟局域网标签范围;E.构造虚拟局域网交换路径实现虚拟租用线。 This method of implementing a virtual leased line comprises the steps of: A ditag using a virtual local area network VLAN tag technology stack; B ditag of the dynamic virtual local area network switching equipment and other standard multi-protocol label switching device can communicate; C extension... label distribution protocol to distribute VLAN tags as topology discovery protocol layer 2 virtual private network; D expansion resource reservation protocol - traffic Engineering assign VLAN tags and consultation VLAN tag range;. E constructing a virtual local area network switching virtual path. leased lines.

Description

实现虚拟租用线的方法 The method of virtual leased line

技术领域 FIELD

本发明涉及虚拟专用网的实现,特别涉及虚拟租用线虚拟专用网的实现。 The present invention relates to virtual private networks, and more particularly to virtual leased line virtual private network.

背景技术 Background technique

基于传输控制协议/网际互连协议(Transmission Control Protocol/ Internet Protocol,简称"TCP/IP")的以太网技术经过30多年的发展,目前已经成为占绝对支配地位的局域网技术,已经成功进入公共网络的核心网、扎根于城域网并逐步渗透到公共接入网络。 Transmission Control Protocol / Internetworking Protocol (Transmission Control Protocol / Internet Protocol, referred to as the "TCP / IP") Ethernet technology after 30 years of development, has become overwhelmingly dominant LAN technology, has successfully entered public network core network, rooted in the metropolitan area and gradually penetrate into a public access network. 几乎对于每一个应用而言,以太网技术已经成为事实上的传输协议标准,由于具有简单、灵活和低成本的特点,它的优势已经远远超过传统的一些技术,比如令牌环(Token Ring)、光纤分步数据接口(Fiber Distributed Data Interface,简称"FDDI")和异步传输模式(Asynchronous Transfer Mode, 简称"ATM")。 For almost every application, Ethernet technology has become the de facto standard transport protocol, due to the simple, flexible and low cost, its advantages far beyond some of the traditional techniques, such as Token Ring (Token Ring ), step fiber data Interface (fiber Distributed data Interface, referred to as "FDDI") and ATM (asynchronous Transfer mode, referred to as "ATM").

随着基于以太网技术的局域网(Local Area Network,简称"LAN")和以太网交换4支术的发展,出现了虚拟局域网(Virtual Local Area Network,简称"VLAN" )。 With LAN-based Ethernet technology (Local Area Network, referred to as "LAN") and four Ethernet switching technique development, there has been a virtual local area network (Virtual Local Area Network, referred to as "VLAN"). VLAN是由电子和电气工程师协会(Institute of Electrical and Electronics Engineers,简称"IEEE" ) 802.1Q定义的一种基于在局域网交换机的基础之上对局域网进行划分的一种技术。 VLAN is (abbreviated "IEEE" Institute of Electrical and Electronics Engineers) one kind defined in 802.1Q technique based LAN is divided by the Institute of Electrical and Electronics Engineers on the basis of the LAN switch.

与此同时,随着以太网技术的发展,人们希望IP网络不仅能够提供传统的电子邮件(e-mail)、上网等服务,还能够提供端到端的转发控制、QoS 等服务。 At the same time, with the development of Ethernet technology, people want to be able to provide IP network not only traditional e-mail (e-mail), Internet and other services, can also provide end-to-forward control, QoS and other services. 多协议标签交换(Multi-ProtocolLabel Switching,简称"MPLS") 就是近年来在IP技术基础之上,结合ATM技术发展起来的一种基于处于链路层头和网络层技术和链路层技术,目前它在虚拟专用网(Virtual Private Networking,简称"VPN"),流量工程,服务质量(Quality of Service,简称"QoS")等领域得到了广泛应用。 MPLS (Multi-ProtocolLabel Switching, referred to as "MPLS") is the basis of IP technology in recent years, in combination with one based on ATM technology developed in the link layer header and the network layer and link layer technologies, current it VPN (virtual private Networking, referred to as "VPN"), traffic engineering, quality of service (Quality of Service, referred to as "QoS") and other fields has been widely used.

MPLS技术中,标签作为一个长度固定为4个字节、具有本地意义的短标识符,位于链路层包头和网络层分组之间,用于标识一个转发等价类 MPLS technique, label as a fixed length of 4 bytes, a short identifier has local significance located between the link layer and the network layer packet header, for identifying a FEC

(Forwarding Equivalence Class ,简称"FEC")。 (Forwarding Equivalence Class, referred to as "FEC"). 其中,FEC是指标签分配协议(Label Distribution Protocol,简称"LDP")进行标签分配时,被归为一类并分配相同标签的具有相同转发特征的一些目的地址前缀或主机地址。 Wherein, the FEC refers to Label Distribution Protocol (Label Distribution Protocol, referred to as "LDP") label distribution, are grouped together and assigned the same label number or host address prefix of the destination address with the same forwarding feature. 特定分组上的标签代表着分配给该分组的FEC。 The label on a specific packet assigned to represent the FEC packet. 标签的封装结构如图1。 Package tag 1 shown in FIG. 其中,Label表示标签值,长度为20比特(bit),是用于转发的指针;分组生命期(Time to Live,简称TTL )长度为8比特,和IP分组中的TTL意义相同;Exp共3比特,作为保留用于试验;S长1比特,表明多层标签所处的层,置1时表示为最底层标签。 Wherein, the Label label value indicates a length of 20 bits ( 'bit), for forwarding pointer; packet lifetime (Time to Live, referred to as TTL) of a length of 8 bits, and TTL in IP packets of the same; Exp total 3 bits, are reserved for testing; S 1-bit length, indicates that the layers of the multilayer labels which, when set is represented as the bottom label. 标签在分组中的封装位置有两种:垫层 Tag position encapsulated in the packet, there are two: Cushion

(SHIM)方式和异步传输模式/帧中继(Asynchronous Transfer Mode/Frame Relay,简称"ATM/FR")方式,如图2。 (SHIM) mode and Asynchronous Transfer Mode / Frame Relay (Asynchronous Transfer Mode / Frame Relay, abbreviated "ATM / FR") mode, as shown in FIG 2.

将特定标签绑定到特定FEC的决定由下游标签交换路由器(Label Switch Router,简称"LSR")作出,下游LSR随后通知上游LSR,即标签由下游指定,标签绑定按照从下游到上游的方向分发。 Decided to label binding specific to a particular FEC by the downstream label switched router (Label Switch Router, referred to as "LSR") is made, downstream LSR notifies the upstream LSR, that is specified by a downstream label, the label bound in the direction from downstream to upstream distribution. 标签分发方式可以是LSR无须从上游获得标签请求消息即进行标签分配与分发的下游自主标签分发,也可以是LSR获得标签请求消息之后才进行标签分配与分发的下游按需标签分发。 LSR label distribution can be obtained without independent label distribution downstream label request messages distributing a label from upstream, downstream or may be performed only demand label distributes a label distribution obtained after the LSR label request message. 标签保持方式也有两种:自由标签保持方式和保守标签保持方式。 There are two label retention modes: liberal label retention mode and conservative label retention mode. 对于特定的一个FEC,如果LSR上游路由器(UpstreamRouter,简称"Ru") 收到了来自LSR下游路由器(Downstream Router,简称"Rd")的标签绑定,当Rd不是Ru的下一跳时,如果Ru保存该绑定,则称Ru使用的是自由标签保持方式;如果Ru丢弃该绑定,则称Ru使用的是保守标签保持方式。 The FEC for a particular, if the upstream LSR router (UpstreamRouter, referred to as "Ru") LSR receives the label binding from the downstream router (Downstream Router, referred to as "Rd") when Rd is not the next hop of Ru and Ru save this binding, then Ru using liberal label retention mode; if Ru discards this binding, then Ru using conservative label retention mode. 当要求LSR能够迅速适应路由变化时可使用自由标签保持方式;当要求LSR中保存较少的标签数量时可使用保守标签保持方式。 Conservative label retention mode may be used when the labels are saved in claim LSR less; when required LSR adapt quickly to changes in the routing label retention mode can be freely used.

如图3所示,MPLS网络的基本构成单元是LSR设备10 (本文用10-1、 10-2等标号区分不同LSR设备),由LSR构成的网络叫做MPLS域。 The basic constituent units shown in FIG, 3 is the MPLS LSR network device 10 (herein, different 10-1, 10-2 and other devices numeral distinguished LSR), constituted by a network called LSR MPLS domain. 位于MPLS域边缘和其它用户网络相连的LSR称为边缘LSR,例如图3所示的LSR设备10-1、 10-2、 10-5、 10-8和10-9;位于MPLS域内部的LSR则称为核心LSR,例如LSR设备10-3、 10-4、 10-6和10-7。 Located on the edge of the MPLS domain and other users connected to the network is called edge LSR LSR, for example, the apparatus shown in FIG LSR 310-1, 10-2, 10-5, 10-8 and 10-9; LSR in an MPLS domain is located it is called core LSR, e.g. LSR device 10-3, 10-4, 10-6 and 10-7. 核心LSR可以是支持MPLS的路由器,也可以是由ATM交换机等升级而成的ATM-LSR。 The core router supports MPLS LSR may be, it can be upgraded from ATM switches from the ATM-LSR. 被标签的分组沿着由一系列LSR构成的标签交换路径(Label Switched Path,简称"LSP")传送,入口LSR叫Ingress,出口LSR叫£gress。 The packet along the label switched path label (Label Switched Path, referred to as "LSP") transmitted inlet called the Ingress LSR, the egress LSR LSR called £ Gress a series configuration. 图3所示由LSR 设备10-2、 10-3、 10-4和10-5连接而成的路径就是一个LSP,该LSP的Ingress 为LSRi殳备10-2, Egress为LSR设备10-5。 LSR by the apparatus shown in FIG. 10-2, 10-3, 10-4 and 10-5 are connected in the path is a LSP. 3, the LSP Ingress is prepared LSRi Shu 10-2, to the Egress LSR device 10-5 .

在Ingress,将进入网络的分组根据其特征划分成FEC。 In the Ingress, the packets entering the network according to their characteristics into FEC. 一般根据IP地址前缀或者主机地址来划分FEC。 The general host address or IP address prefix to divide FEC. 这些具有相同FEC分组在MPLS区域中将经过相同的路径,即LSP。 These have the same FEC packets in MPLS area through the same path, i.e. LSP. LSR对到来的FEC分组分配一个短而定长的标签, 然后从相应的接口转发出去。 LSR incoming FEC packets may be assigned a short length of the label, and then forwards the corresponding interface.

在LSP沿途的LSR上都已建立了输入/输出标签的映射表,该表的元素叫下一跳标签转发条目(Next H叩Label Forwarding Entry,简称NHLFE)。 On LSR LSP have been established along the mapping table input / output labels, elements of this table is the next hop label forwarding entry (Next H rapping Label Forwarding Entry, referred NHLFE). 对于接收到的标签分组,LSR只需根据标签从表中找到相应的NHLFE,并用新的标签来替换原来的标签,然后对标签分组进行转发,这个过程叫输入标签映射(Incoming Label Map,简称"ILM" ) 。 For received label packet arrives, LSR only to find the tag from the table corresponding to the NHLFE, and use a new label to replace the old label, and the labeled packet forwarding process called Incoming Label Map (Incoming Label Map, referred to as " ILM "). NHLFE中除了包含有下一跳标签外,还有链路层封装信息等其它必要的内容。 NHLFE contains, in addition to the next hop tag, there are other necessary information content link layer encapsulation.

MPLS对特定分组进行的FEC指定只需要在网络入口处进行,后续路由器只需简单的转发即可,较常规的网络层转发要简单的多,从而提高了转发速度。 FEC MPLS packets designated for a particular requires only the entrance of the network, the router simply forwards subsequent to, more conventional network layer forwarding is much simpler, thereby improving the forwarding speed.

MPLS对于实现流量工程的意义是十分重大的。 MPLS traffic engineering for the realization of significance is very significant. 它能实现其它模型所实现的各种流量工程功能,而且成本很低,更重要的是,它还可以实现流量工 It can achieve a variety of traffic engineering features of other models implemented, and low cost, more importantly, it can achieve traffic engineering

程功能的部分自动化。 Part of automation functions. 目前多采用资源预留协议(Reservation Protocol ,简称"RSVP,,)-流量工程(Traffic Engineering,简称"TE")来支持MPLSTE, 它在RSVP的基础上进行流量工程的扩展。在RSVP-TE中,主要的消息有PATH和RESV两种,他们都是对RSVP中的相应消息的扩展。RSVP-TE的PATH和RESV消息中,主要包含下列几种对象:向下游请求标签的标签请求对象(Label Request Object),指定严格或松散的显示路径的显式路径对象(Explicit Route Object),为上游提供标签的标签对象(Label Object), 记录经过的路由用于环路检测的路由记录对象(Record Route Object),控制LSP的流量工程属性会话属性对象(Session Attribute Object)和有关带宽资源的配置的说明对象(Tspec Object)。除了扩展消息对象,RSVP-TE还可以使用消息合并技术、消息标识符(MESSAGE—ID)技术、摘要刷新技术和HELLO协+义扩展纟支术进4于改进。 The current use of the Resource Reservation Protocol (Reservation Protocol, referred to as "RSVP ,,) - Traffic Engineering (Traffic Engineering, referred to as". TE ") to support MPLSTE, which expanded on the basis of traffic engineering in RSVP on RSVP-TE the main PATH and RESV messages have two kinds, they are the PATH and RESV messages of the RSVP message for the corresponding extension .RSVP-TE, the main types of objects comprising the following: a request to a downstream label request object label (label Request Object), the specified display strict or loose explicit route path object (explicit route Object), the object to provide a tag label (label Object) upstream, the object record route record (record route for routing through the loop detection Object), the control traffic engineering LSP attribute object attribute session (session attribute Object) and associated bandwidth resources described object configuration (Tspec Object). in addition to expanding the message object, RSVP-TE message combining techniques may also be used, message identifier ( MESSAGE-ID) technology, and technology HELLO Srefresh extended sense RA + Si 4 on improving branched into operation.

MPLS还支持LSP隧道(Tunnel)技术。 MPLS also supports LSP tunnel (Tunnel) technology. 在一条LSP路径上,LSR Ru 和LSRRd互为上下游,但LSRRu和LSRRd之间的路径可能并不是路由协议所提供路径的一部分,MPLS允许在LSR Ru和LSR Rd间建立一条新的LSP路径〈Ru Rl ...Rn Rd>, LSR Ru和LSR Rd分别为这条LSP的起点和终点。 On an LSP path, LSR Ru and the downstream LSRRd each other, but between the path and the LSRRd LSRRu routing protocol may not provide a portion of the path, the MPLS allows establishing a new LSP path between LSR Ru and LSR Rd < Ru Rl ... Rn Rd>, LSR Ru and LSR Rd are the starting point and end point of this LSP. LSR Ru和LSR Rd间的LSP就是LSP隧道,它避免了传统的网络层封装隧道。 LSP between the LSR Ru and LSR Rd is LSP tunnel, which avoids the traditional network layer encapsulation tunnel. 当隧道经由的路由和逐跳从路由协议取得的路由一致时,这种隧道叫逐跳路由隧道;若不一致,则这种隧道叫显式路由隧道。 When the tunnel through the same routes and route-by-hop routing protocol obtained from this tunnel called by-hop routing tunnel; if not, then this tunnel is called explicit routing tunnel. 当分组在LSP隧道中传送时,分组的标签就会有多层。 When the packet is transmitted in LSP tunnel, there will be a multi-layer label of the packet. 在每一隧道的入口和出口处要进行标签栈的入栈和出栈操作,每发生一次入栈操作标签就会增加一层。 In each of the inlet and outlet of the tunnel to be subjected to the label stack and stack pop operations, each incoming operation occurs one label will be added. MPLS对标签栈的深度没有限制。 There is no limit on the depth MPLS label stack. 如图4所示,LSP<R2R21 R22R3〉就是R2、 R3间的一条隧道。 Shown, LSP <R2R21 R22R3> is a tunnel between R2, R3 4 as shown in FIG.

LDP实现LSP的建立,即将FEC和标签进行绑定,并将这种绑定通告LSP上相邻LSR。 LDP to achieve the establishment of LSP, will soon FEC with the label binding, then advertising this binding to the adjacent LSR on LSP. LDP规定了LSR间的消息交互过程和消息结构,以及路由选择方式。 LDP message specifies the interaction and message structure, and the routing system between LSR. LSR通过周期性地发送Hello消息来发现LSR邻居,然后与新发现的相邻LSR间建立LDP会话。 LSR LSR to discover neighbors by periodically sending Hello message, then the LDP session is established between the newly discovered neighbor LSR. 通过LDP会话,相邻LSR间通告标签交换方式、标签空间、会话保持定时器值等信息。 By LDP session between neighboring LSR advertised label switching mode, label space, holding information session timer value and the like. LDP会话是TCP连接,需通过LDP消息来维护,如果在会话保持定时器值规定的时间内没有其它LDP消息,那么必须发送会话保持消息来维持LDP会话的存在。 LDP session is a TCP connection needs to be maintained through LDP message, if the session is not held in the other LDP message within a predetermined time the timer value, it must send session Hold message to the LDP session is maintained. MPLS还支持基于约束路由的LDP机制(Constrain-based RoutingLDP,简称"CR-LDP,,)。 所谓CR-LDP,就是入口节点在发起建立LSP时,在标签请求消息中对LSP 路由附加了一定的约束信息。这些约束信息可以是对沿途LSR的精确指定, 此时叫严格的显式路由;也可以是对选择下游LSR时的模糊限制,此时叫松散的显式路由。 MPLS LDP mechanism also supports a constraint-based routing (Constrain-based RoutingLDP, referred to as "CR-LDP ,,). The so-called CR-LDP, when the ingress node initiates the establishment of LSP, in the label request message for a certain additional route LSP constraint information constraint information which may be precisely specified LSR along the way, in which case known as strict explicit routing; may be selected when the fuzzy limit downstream LSR, when called loose explicit routing.

虛拟租用线(Virtual Leased Line ,简称"VLL")能使分布于不同地域的用户网络通过网络提供商网络资源建立的专用虚拟通道进行通信。 Virtual leased line (Virtual Leased Line, referred to as "VLL") allows users located in different areas of the network established by the network provider network resources dedicated virtual channels for communication. VLL 中,网络提供商不参与拥护网络的路由,只提供这些不同地域的用户网络之间的链路层的互通,并保证通信过程中保护用户网络的私有性的一种新技术、 新业务,这种业务经常被归类为二层(Layer2,简称"L2" ) VPN。 VLL, the network provider is not involved in advocacy network routing, link layer only provides interoperability between these different areas of network users and ensure privacy of communications technology, a new process for protecting users' networks, new business, such traffic is often classified as a Layer (Layer2, referred to as "L2") VPN.

现有的实现VLL主要有三种方案,下面分别介绍。 VLL existing implementations There are three main program, the following were introduced.

目前业界可以通过点到点的MPLS L2 VPN实现VLL,即网络运营商负责向用户提供二层的连通性,而不需参与VPN用户的路由计算。 The industry can be achieved through a point-to-MPLS L2 VPN VLL, namely network operators responsible for providing connectivity to the second floor to the user, without the need to participate in routing VPN user's computer. 简单地说, MPLS L2 VPN就是在MPLS网络上透明地传递用户的二层数据。 Briefly, MPLS L2 VPN is transparently transmit Layer 2 data on the MPLS network. 从用户角度来看,该MPLS网络就是一个二层交换网络,用户可通过网络在不同站点之间建立二层连接。 From the user perspective, the MPLS network is a Layer 2 switching network, a user may establish Layer 2 connections between different sites via a network. 在二层VPN中,由于服务供应商不参与路由,因此可以 VPN on the second floor, because service providers do not participate in routing, so you can

自然而然地实现客户路由的保密性。 Naturally achieve the confidentiality of customer routes. 以ATM为例,每个CE配置一个ATM 虛电路,通过MPLS网络与远端CE设备相连,这一过程与通过ATM网络 ATM as an example, a configuration of each ATM virtual circuit CE, connected through the MPLS network with the remote CE device, through the ATM network to process

实现互联完全一样。 Interconnected exactly the same. MPLSL2VPN组网示意图如图5所示Protocol,简称"MP-BGP")扩展实现,也可以通过LDP扩展实现。 Networking Protocol MPLSL2VPN schematic shown in FIG. 5, referred to as "MP-BGP") extension implementation, may be realized by LDP extension. 两种实现方式的帧封装模式相同,具体实现可以参照draft-martini-12circuit-encap-mpls-04。 The same two frame encapsulation mode of realization, the specific implementation can refer to draft-martini-12circuit-encap-mpls-04.

技术方案一通过MP-BGP扩展实现的L2VPN,称为KompellaMPLSL2 VPN方式。 By a technical solution L2VPN MP-BGP extension implementation, called KompellaMPLSL2 VPN embodiment. 在Kompella MPLS L2 VPN中,用户网边缘路由器(Custom Edge Router,简称"CE")、供应商边缘路由器(Provider Edge Router,简称"PE") 和P的概念与BGP/MPLS VPN—样,原理也4艮近似,也是利用标签栈来实现用户报文在MPLS网络中的透明传送。 In Kompella MPLS L2 VPN, the user edge routers (Custom Edge Router, referred to as "CE"), and the concept of BGP provider edge router (Provider Edge Router, referred to as "PE") and P / MPLS VPN- like, also the principle Gen approximately 4, also the use of the label stack to implement the user transparent transmission of packets in the MPLS network. 其中外层标签即Tunnel标签用于将报文从一个PE传递到另一个PE,内层标签即VC标签用于区分不同VPN中的连接,接收方PE可根据VC标签决定将报文传递到哪个CE。 I.e., wherein the outer label tag for Tunnel packets from one PE to another PE, i.e. inner label VC label used to distinguish different VPN connection in the receiving PE can be transmitted to the packet according to the VC determines which label CE. 在转发过程中,报文标签栈的变化如图6所示。 In the forwarding process, changes in the label stack as shown in Figure 6. 关于Kompella MPLS L2 VPN的实现可以参照draft-kompella-ppvpn-12vpn-02。 On achieving Kompella MPLS L2 VPN may refer to draft-kompella-ppvpn-12vpn-02.

技术方案二通过LDP扩展实现的L2 VPN,称为Martini MPLS L2 VPN 方式。 Technical Solution LDP extension implemented by two L2 VPN, referred to as embodiment Martini MPLS L2 VPN. 它着重解决如何在两个CE之间建立VC的问题。 It focuses on solving the problem of how to establish a VC between two CE. Martini MPLS L2 VPN采用VC-TYPE+VC-ID来识别VC,其中,VC-TYPE表明VC的类型为ATM、 VLAN或点到点协议(Point to Point Protocol,筒称"PPP"),而VC-ID用于唯一标志一个VC。 Martini MPLS L2 VPN using VC-TYPE + VC-ID to identify the VC, wherein, VC-TYPE is a VC type of ATM, VLAN, Point to Point Protocol (Point to Point Protocol, said cartridge "PPP"), and VC- ID is used to uniquely identifies a VC. 在同一VC-TYPE的所有VC中,VC-ID在整个SP网络中具有唯一性,连接两个CE的PE通过LDP交换VC标签,并通过VC-ID将对应的CE绑定起来。 In all VC in the same VC-TYPE, VC-ID has unique properties throughout the SP network, connecting the two PE through a CE LDP exchange VC label, and binding them by VC-ID corresponding CE. 在连接两个PE的LSP建立成功,双方的标签交换和绑定完成后, 一个VC就建立起来了,两个CE即可通过该VC 传递二层数据。 Establish the connection of two PE LSP success, after the label exchange and the binding is complete, a VC is set up, two CE can be passed through the two-story data VC. 为了在PE之间交换VC标签,Martini草案对LDP进行了扩展,增加了VC FEC的FEC类型。 To VC label exchanged between the PE, Martini draft LDP is extended to increase the VC FEC of FEC type. 此外,由于交换VC标签的两个PE可能不是直接相连的,因此LDP必须采用远端对等层来建立会话,并在该会话上传递VC FEC和VC标签。 Further, since the two PE exchange VC labels may not be connected directly, so remote peer LDP must establish a session layer, and transmitting the VC FEC and VC label on the session. 在该方式实现的VLL中,使用LDP作为传递虚通道(Virtual Channel,简称"VC")信息的信令。 In this manner the VLL, a virtual channel is transmitted as LDP (Virtual Channel, referred to as "VC") signaling information. PE之间将建立LDP的 The establishment of the LDP between PE

远程会话,PE为CE之间的每条连接分配一个VC标签。 Remote session, PE between the CE for each tag is assigned a VC connection. 二层VPN信息将 Layer VPN information

10携带着VC标签,通过LDP建立的LSP转发到远程会话的对端PE。 10 carries VC label, established by LDP LSP forwarded to the peer PE remote session. 这样实际上在普通的LSP上建立了一条VC LSP。 This effectively established a VC LSP on a common LSP. 在Ingress PE上,数据包在进入LSP之前,先在数据包内层打上VC标签,然后再打上LSP的标签,这样, 到达Egress PE上时,剥掉LSP外层标签后,根据VC标签,就知道是哪个VC的,并据此转发到正确的CE上。 When the Ingress PE, before entering the LSP packet, the first packet marked inner VC label, and then call on the LSP label, so that, on reaching the Egress PE, the outer label peeled LSP, according to the VC label, it I know which VC, and, accordingly forwarded to the correct CE. 这种方式,配置一条VC连接,需在相关的两个PE上各配置一个单向连接。 In this manner, a configuration VC connections, each required to configure a two-way connected to the associated PE. 关于Martini MPLS L2 VPN的实现可以参照、draft-martini-12circuit-trans-mpls-10 。 Martini MPLS L2 VPN implemented on can be referred, draft-martini-12circuit-trans-mpls-10.

技术方案三使用VLAN技术实现VPN。 Technical Program III using VLAN technology VPN. 基于IEEE 802.1 Q封装的协议——虚拟局域网双标签(QinQ)技术,其核心思想是将用户私网VLAN标识(tag)封装到公网VLAN tag上,报文带着两层tag穿越服务商的骨干网络,从而为用户提供一种较为简单的二层VPN隧道。 Based on the IEEE 802.1 Q encapsulation protocols - Virtual Local Area Network tag bis (the QinQ) technology, the core idea is to private VLAN identifier (tag) is mounted onto the public network VLAN tag, tag through the packet with two service providers backbone network, providing users with a simpler Layer 2 VPN tunnels. QinQ协议是一种简单而易于管理的协议,它不需要信令的支持,仅仅通过静态配置实现来维持隧道的建立,特别适用于小型的,以三层交换机为骨干的企业网或小规模城域网。 QinQ protocol is a simple and easy to manage protocols, it does not require signaling support, just to keep up a tunnel through static configurations, especially for small to three switches as the backbone of enterprise networks or small-scale city area network. 图7为基于传统的IEEE 802.1Q协议的网络。 7 is based on the conventional IEEE 802.1Q protocol network. 图7所示这种配置方法必须使用户的VLAN在骨干网络上可见,不仅耗费服务提供商宝贵的VLAN ID 资源,而且还需要服务提供商管理用户的VLAN号,用户没有自己规划VLAN 的权利。 This configuration shown in Figure 7 must be visible on the user's VLAN backbone network, not only consuming valuable service provider VLAN ID resources, but also require service providers to manage the user's VLAN number, users do not have the right to plan their own VLAN. 为了解决上述问题,QinQ协议向用户提供一个唯一的公网VLAN ID, 将用户私网VLAN tag封装在这个新的公网VLAN ID中,依靠它在公网中传播,用户私网VLAN ID在公网中被屏蔽,从而大大地节省了服务提供商紧缺的VLANID资源,如图8所示。 To solve the above problems, the QinQ protocol provides a unique public VLAN ID to the user, the user private VLAN tag is encapsulated in this new public VLAN ID, relying on it spread in the public network, private network VLAN ID in the public network is shielded, thereby greatly saving the resources of the service provider VLANID shortage, as shown in FIG. 公网只需要向用户分配一个VLAN3号, 无论用户网内部规划了多少个私网VLAN ID,当带有tag的用户报文进入服务提供商的骨干网络时,都统一地强行插入新分配的公网VLAN号,通过该公网VLAN号穿过骨干网络,报文到达骨干网另一侧PE设备后,剥离公网VLANtag,还原用户报文,然后再传送给用户的CE设备。 Public network user only needs to assign a number VLAN3, no matter how many internal user network planning private network VLAN ID, when a user with a tag of packets into the service provider's backbone network, are uniformly forced into the new allocation of public after the network VLAN ID, VLAN ID through the public network through the backbone network, the packet reaches the other side of the PE backbone network, public network peeling VLANtag, reduction of user packets, and then sent to the user equipment CE. 因此,在骨干网中传递的报文具有两层802.1Q tag头, 一个是公网tag, —个是私网tag。 Accordingly, in the transmitted packet backbone network having two 802.1Q tag header, the public network is a tag, - a private network tag. 由于CE1的出端口为干线(Trunk)端口,因此用户发往PE1的报文均携带用户私网的VLAN tag (范围是200-300),如图9;进入PE1后,由于入端口为QinQ的接入端口, PE1不理会用户私网的VLAN tag,而是将入端口缺省VLAN 3的tag强行插入用户报文,如图10;在骨干网,报文沿着Trunk VLAN3的端口传播,用户私网的tag在骨干网中保持透明状态,直至到达网络边缘设备PE2; PE2发现与CE2相连的端口为VLAN 3的接入端口,按照传统802.1Q协议剥掉VLAN 3的tag头,恢复成用户的原始报文,然后发送给CE2,恢复的原始报文和图9所示相同。 Since the output ports of the trunk (Trunk) port CE1 and PE1 sent to the user packets are VLAN tag carried in the private network (range 200-300), as shown in FIG 9; into PE1, since the port of QinQ access port, PEl ignore the VLAN tag of the private network, but the inlet port of the default VLAN 3 forcibly inserting user packet tag, FIG. 10; in the backbone network, packets propagating along Trunk VLAN3 port, the user tag in the private network backbone remains transparent until they reach the edge device PE2; PE2 and CE2 discovery port is connected to an access port of VLAN 3, stripped tag VLAN 3 in a conventional head 802.1Q protocol, restored to the user original packet, and then sent to CE2, the same as in FIG. 9 and restore the original packet of FIG.

在实际应用中,上述方案存在以下问题:技术方案一和技术方案二所述的VLL实现方案存在复杂的封装协议,并且对于以太城域网的情况下,封装开销较大;技术方案三所述的QinQ实现VLL的方案在网络较大时的配置工作和维护工作很大。 In practical applications, the presence of the above-described embodiment the following problems: VLL of the two aspect and a technical solution there is a complex encapsulation protocol scheme, and for the case where the Ethernet MAN, larger encapsulation overhead; aspect of the three the QinQ achieve VLL configuration program of great work and maintenance work in a large network.

造成这种情况的主要原因在于,技术方案一和技术方案二所述的VLL实现方式是#4居MPLS标签进行交换,协议比4交复杂,而且由于存在两层MPLS标签和两个以太网链路层帧头,因此封装开销大;技术方案三的标签是静态配置的,因此当网络较大时,配置和维护都比较困难,导致工作量加大。 Main reason for this is that, according to two VLL aspect of a technical solution and embodiment # 4 is exchanged UN MPLS label, protocol cross complicated than 4, and the presence of two double MPLS labels and Ethernet link Road-layer header, so big spending package; technical program three labels are statically configured, so that when a larger network, configuration and maintenance are more difficult, resulting in increased workload.

发明内容 SUMMARY

有鉴于此,本发明的主要目的在于提供一种实现虚拟租用线的方法,使得能够充分利用现有设备,在封装简单、开销较小的同时又能实现自动配置并保证流量工程等方面的要求。 In view of this, the main object of the present invention is to provide a method for implementing a virtual leased line, enabling full use of existing equipment, and can be automatically configured in a simple package, while a small overhead and to ensure the traffic engineering requirements .

为实现上述目的,本发明提供了一种实现虚拟租用线的方法,包含以下步骤: To achieve the above object, the present invention provides a method for implementing a virtual leased line, comprising the steps of:

B使动态虚拟局域网双标签交换设备和多协议标签交换设备实现互通;C扩展标签分配协议以分发虚拟局域网标签并作为二层虚拟专用网的 B of the dynamic virtual local area network switching equipment ditag and Multiprotocol Label Switching device can communicate; C extended label distribution protocol to distribute the virtual local area network tag as a virtual private network Layer

拓朴发现协议; Topology Discovery Protocol;

D扩展资源预留协议-流量工程分配虚拟局域网标签并协商虚拟局域网标签范围; D expansion Resource Reservation Protocol - Traffic Engineering assign VLAN tags and consultation VLAN tags range;

E构造虚拟局域网交换路径实现虚拟租用线。 E constructing a virtual local area network switching path virtual leased line.

其中,从不同接口进入的相同虚拟局域网作为不同的标签对待。 Among them, from the different interfaces into the same virtual LAN treated as different labels.

所述标签栈可以只有一层;当所述标签栈大于等于两层时,最外层的两层标签采用虚拟局域网双标签格式,其余标签采用标准的标签格式。 The label stack may be in one layer; when the label stack of two or greater, the outermost layers double VLAN tag label format employed, the remaining tag label format standard.

所述步骤B还包含如下子步骤: Said step B further comprises the substeps of:

Bl当所述动态虚拟局域网双标签交换设备位于上游时,在所述动态虚拟局域网双标签交换设备出接口上完成从虚拟局域网双标签封装到多协议标签交换封装的转换; Bl dynamic virtual local area network when the dual tag switching device located upstream, in the dynamic virtual local area network ditag exchange equipment from an interface on the virtual local area network encapsulated ditag conversion MPLS encapsulation;

B2当所述动态虚拟局域网双标签交换设备位于下游时,不改动上游多 B2 dynamic virtual local area network when the switching device is in the ditag downstream, not upstream multiple changes

交换设备分配一个范围和虚拟局域网标签相同的普通多协议标签交换标签, 在所述动态虚拟局域网双标签交换设备入接口上识别多协议标签交换标签并作为虚拟局域网标签处理。 Same range switching device is assigned a VLAN tag and ordinary Multiprotocol Label Switching label switching virtual local area network device into the ditag multiprotocol label switching interface identification tag and VLAN tag as said dynamic process.

所述步骤B还包含如下子步骤: Said step B further comprises the substeps of:

Bl当所述动态虚拟局域网双标签交换设备位于上游时,在所述动态虚拟局域网双标签交换设备出接口上完成从虚拟局域网双标签封装到多协议标签交换封装的转换; Bl dynamic virtual local area network when the dual tag switching device located upstream, in the dynamic virtual local area network ditag exchange equipment from an interface on the virtual local area network encapsulated ditag conversion MPLS encapsulation;

B2当所述动态虚拟局域网双标签交换设备位于下游时,改动上游多协议标签交换设备支持虚拟局域网双标签封装,所述动态虚拟局域网双标签交换设备给上游多协议标签交换设备分配虚拟局域网标签。 B2 when the dynamic virtual local area network switching equipment is located downstream of the ditag, changes upstream device supports multi-protocol label switching VLAN encapsulation ditag, the ditag dynamic VLAN switching device to an upstream MPLS device allocation VLAN tag. 所述步骤C中定义虚拟局域网标签类型长度值在标签映射消息中使用, 向上游设备分配虚拟局域网标签。 Step C The VLAN tag defined in a type length value used in the label mapping message, the VLAN tag assigned to the upstream device.

所述步骤C中定义虛拟局域网会话参数和邻居设备协商虚拟局域网标签。 Step C The defined virtual local area network device negotiates session parameters and the neighbor VLAN tag.

在标签分配协议初始化消息中,所述动态虛拟局域网双标签交换设备利用所述虚拟局域网会话参数通知邻居设备自己是一个动态虚拟局域网双标签交换设备。 In the label allocation protocol initialization message, the ditag dynamic virtual local area network switching device utilizing the virtual local area network devices themselves neighbor notification session parameter is a dynamic virtual local area network switching equipment ditags.

标签分配协议初始化后,向邻居设备分配标签时,分配定义范围内的虚拟局域网标签值。 After the label distribution protocol initialization, when a neighbor device to assign labels, assign VLAN tag value within a defined range.

所述步骤D中通过在资源预留协议-流量工程的路径消息中增加虚拟局域网标签请求对象协商虚拟局域网标签范围。 Increase negotiation request object VLAN tag VLAN tag area Path message traffic engineering - a resource reservation protocol in the step D through.

通过比较可以发现,本发明的技术方案与现有技术的区别在于,本发明方案综合采用了现有三种技术方案的实现思想,利用VLAN标签进行交换并扩展MPLS实现VLL。 It can be found by comparing the difference aspect of the present invention and the prior art that the present invention is implemented using a combination of three kinds of prior art solutions thought, using the VLAN tag and extend MPLS exchange implemented VLL.

这种技术方案上的区别,带来了较为明显的有益效果,即首先,本发明提出实现VLL的方法综合了现有技术方案的优点,协议简单,封装开销较小而且配置维护均较方便;其次,本发明方案基于MPLS扩展实现,而目前各厂商设备均支持MPLS信令协议,在此基础上扩展MPLS协议来实现QinQ VLAN交换的VLL,将充分利用现有设备,容易获得厂商的广泛支持;第三, 本发明方案采用MPLS协议,对现有协议只需进行筒单修改,升级方便,可以迅速的部署业务。 Difference in this solution brings obvious advantageous effect, i.e. firstly, the present invention proposes a method implemented VLL combines the advantages of the prior art solutions, a simple protocol, cost and smaller package than that easy configuration maintenance; Secondly, the present invention is based on MPLS extension implementation, various manufacturers and device support MPLS signaling protocol, to achieve VLL QinQ VLAN exchanged based on MPLS protocol extension, the full use of existing equipment, readily widely supported vendors ; third, embodiment of the present invention employs the MPLS protocol, the existing protocol only be modified single-cylinder, easy to upgrade, may be quickly deployed services.

附图说明 BRIEF DESCRIPTION

图1为MPLS技术中标签的封装结构示意图; Figure 1 is a schematic structural view of the package in the art MPLS label;

图2为MPLS技术中标签在分组中的封装位置示意图;图3为MPLS网络的组成示意图; FIG 2 is a schematic diagram of MPLS label encapsulated in the packet position; FIG. 3 is a schematic diagram illustrating a MPLS network;

图4为MPLS技术中LSP隧道实现的示意图; FIG 4 is a schematic art MPLS LSP tunnels implemented;

图5为MPLS L2 VPN组网示意图; FIG 5 is a schematic MPLS L2 VPN network;

图6为KompellaMPLS L2 VPN方式实现VLL的方案中,在转发过程中报文标签栈变化的示意图; FIG 6 is a schematic representation of KompellaMPLS L2 VPN VLL manner, the packet forwarding process in the change of label stack;

图7为基于传统的IEEE 802.1Q协议的网络示意图; FIG 7 is a schematic diagram of a conventional network protocol based on IEEE 802.1Q;

图8为QinQ协议实现VLL的典型组网示意图; 8 is a schematic view of a typical networking protocol QinQ the VLL;

图9为QinQ协议实现VLL的方案中,用户发往PE1的报文封装示意图; FIG 9 is a program VLL QinQ protocol, the packet encapsulation is a schematic PE1 destined user;

图10为QinQ协议实现VLL的方案中,报文进入PE1后的报文封装示意图。 FIG 10 is a protocol implementation VLL QinQ embodiment, the packet encapsulation schematic view of the packets enter PE1.

具体实施方式 Detailed ways

为使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步地详细描述。 To make the objectives, technical solutions, and advantages of the present invention will become apparent in conjunction with the accompanying drawings below of the present invention will be described in further detail.

本发明提出的实现VLL的方法,针对目前在城域网中大量使用以太网交换机的现状,利用以太网技术自身的特点,从技术简单性和普遍性出发,基于VLAN标签交换和MPLS扩展实现,其基本原理是VLAN交换和本地化, 并采用这种技术来建立VLL。 VLL proposed method to achieve the present invention, for the current status of the use of a large number of Ethernet switches in the metropolitan area, the use of Ethernet technology itself characteristics, from a technical simplicity and universality, based VLAN and MPLS label switching extension implementation, The basic principle is VLAN switching and localization, and use this technology to build VLL. 本发明方案利用以太网802.1Q封装中的VLAN 标识作为标签,用QinQ技术实现两层标签栈,并利用以太网帧头封装净荷, 同时扩展MPLS协议来实现VLAN标签的自动分配,并借鉴和MPLS相关的现有成熟技术,来实现和现有三种技术方案的互通,以及保证流量工程等方面的要求。 The present invention utilizes embodiment 802.1Q Ethernet VLAN identification tag as package to achieve two-level label stack with QinQ technique, and the use of Ethernet header encapsulating the payload, while the extension MPLS protocol to achieve automatic assignment VLAN tag, and reference and established technologies related to MPLS, and to achieve interoperability three types of existing technical solutions, as well as to ensure the requirements of traffic engineering.

要实现本发明方案,MPLS扩展协议要完成以下工作: l.定义一种新的标签类型:将VLAN作为一种新的标签类型,其范围为 To implement the present invention, the MPLS protocol extension to do the following: L define a new tag type: The VLAN tag as a new type, the range of

150-4095,由于VLAN数目少,建议标签空间为每接口标签空间; 150-4095, due to the small number of the VLAN, label space is recommended label space per access;

2. 邻居之间协商VLAN标签:标签由下游设备通知上游设备,因此必须通知邻居设备本设备采用VLAN标签,也就是强制邻居设备分配一个VLAN 标签给自己; 2. neighbor negotiation between VLAN tag: a tag notify the upstream device downstream device, it is necessary to inform neighboring devices of the present device uses a VLAN tag, which is forced to assign a VLAN tag device neighbor himself;

3. 同MPLS标签的互通:允许邻居设备支持MPLS,完成VLAN标签交 3. interworking with MPLS Label: Allows neighbor device supports MPLS, VLAN tag to complete post

换; change;

4. 实现VLAN标签栈:本发明方案采用QinQ技术实现VLAN标签栈, 目前允许2层,也可考虑扩展到无限层次,也允许设备仅支持一层VLAN标签,其它标签采用MPLS标签; 4. The realization of VLAN label stack: the present invention uses the label stack of VLAN QinQ technique, currently allows layer 2, can also be considered extended to unlimited levels, also allows the device supports only one layer VLAN tags, MPLS labels using other tags;

5. 建立VLL:在构造VLAN交换路径后,将两端用户VLAN连接起来。 5. Establish VLL: After the VLAN switching path is configured to connect together both ends of the user VLAN.

依照上述的构思,就可以基于VLAN标签交换和MPLS扩展实现VLL。 According to the above idea can be extended to achieve, and VLL based VLAN label switching MPLS.

下面结合本发明的一个具体实施例来说明本发明方案。 Below in connection with a specific embodiment of the present invention will be described embodiment of the present invention.

在本发明的一个较佳实施例中,定义的一种新的标签类型即VLAN标签,其范围为0-4095。 In one embodiment of the present invention, in preferred embodiments, define a new type of tag VLAN tag i.e., the range of 0-4095. 在转发平面上,VLAN标签和IEEE 802.1Q中的规定相同,长度为12比特。 On the forwarding plane, the same provisions of IEEE 802.1Q VLAN tag and the length of 12 bits. 在支持标签栈时,最外层的两层标签采用QinQ格式, 其余标签采用标准的标签格式。 In support of the label stack, the outermost layers QinQ format using tags, the rest of the tag label format standard. 由于VLAN值范围有限,必须支持每接口的标签空间,因此在本发明的一个较佳实施例中,从不同接口进入的相同VLAN 作为不同的标签对待。 Due to the limited VLAN range, label space must support each interface, in one preferred embodiment of the present invention, different from the same VLAN as the interface enters treat different labels. 每平台的标签空间可选。 Each platform label space optional. 由于这种动态分配的VLAN 标签应用于二层透明传输,因此也不需要TTL,即不支持MPLSTTL。 Because of this dynamic assignment VLAN tag is applied to the Layer 2 transport and therefore do not need to TTL, i.e. not supported MPLSTTL. 其环路检测依靠信令平面完成。 Which relies on the signaling plane loop detection is completed.

在本发明的一个较佳实施例中,支持VLAN标签与MPLS标签的互通。 In one embodiment of the present invention, in preferred embodiments, supports interworking with MPLS label VLAN tag. 即允许支持这种MPLS扩展协议分配的QinQ VLAN的交换设备(本文中暂称该设备为动态QinQ交换设备)的邻居是一个不支持动态QinQ的标准MPLS设备。 That allowed MPLS to support this extension protocol assigned QinQ VLAN switching device (herein tentatively called the device a dynamic QinQ switching equipment) is a neighbor does not support dynamic QinQ standard MPLS devices. 当动态QinQ交换设备位于上游时,在动态QinQ交换设备的出接口上,需要完成从QinQ封装到MPLS封装的转换。 When the dynamic QinQ switching device is located upstream, in the dynamic interface QinQ switching device, from the QinQ encapsulation to complete the conversion of the MPLS encapsulation. 当动态QinQ交换设备位于下游时,有两种可选项: When the dynamic QinQ switching device located downstream, there are two options:

第一种方案可以不改动上游的MPLS设备。 The first embodiment can not change the upstream MPLS device. 在动态QinQ交换设备的入接口上识别MPLS标签,把它当作VLAN标签来处理。 Identifying the MPLS label at the dynamic interface QinQ switching device, as it VLAN tag processing. 这时,动态QinQ交换设备给上游分配一个普通MPLS标签,但范围和VLAN标签相同,为0-4095。 In this case, the dynamic QinQ switching device assigns a common MPLS label to the upstream, but the same range and the VLAN tag is 0-4095.

另一种方案改动上游MPLS设备。 Another embodiment an upstream MPLS equipment modifications. 要求上游设备支持动态QinQ标签封装。 Requirements upstream device supports dynamic label QinQ encapsulation. 这时,动态QinQ交换设备给上游分配VLAN标签。 At this time, dynamic assignment VLAN QinQ switching device to the upstream label.

LDP在MPLS中起了两个作用, 一是作为标签分发协议, 一是作为L2 VPN中的拓朴发现协议。 LDP played two roles in MPLS, first as a label distribution protocol, first as the L2 VPN topology discovery protocol. 在实现QinQ VLAN交换时,需要对LDP扩展,完成上述功能。 When implementing QinQ VLAN switching, LDP needs to extend, the above function.

在本发明的一个较佳实施例中,为了支持VLAN交换,需要定义一种新的标签类型长度值(Type Lenth Value,筒称"TLV"),称为VLAN Label TLV。 In a preferred embodiment of the present invention, in order to support VLAN switching, the need to define a new tag type length value (Type Lenth Value, said cartridge "TLV"), referred to as VLAN Label TLV. 才各式如下: Just all kinds as follows:

0 12 3 0123

01234567890123456789012345678901 01234567890123456789012345678901

+_+_+—+_+_+—+—+—+—+_+—+—+—+—+_+-+—+—+—+—+—+_+_+—+—+—+—+—+_+—+—+_+ + _ + _ + - + _ + _ + - + - + - + - + _ + - + - + - + - + _ + - + - + - + - + - + - + _ + _ + - + - + - + - + - + _ + - + - + _ +

|0|0| VLAN Label (0x0203) | Length I | 0 | 0 | VLAN Label (0x0203) | Length I

+_+—+—+—+-+_+-+—+_+_+—+—+—+_+_+_+_+_+—+—+—+_+-+—+—+—+—+-+-+-+_+—+ + _ + - + - + - + - + _ + - + - + _ + _ + - + - + - + _ + _ + _ + _ + _ + - + - + - + _ + - + - + - + - + - + - + - + - + _ + - +

I Reserved I VLAN I I Reserved I VLAN I

+—+—+—+—+—+—+—+—+—+-+_+_+—+—+—+_+_+—+—+—+—+—+_+—+—+-+—+—+—+—+—+_+ + - + - + - + - + - + - + - + - + - + - + _ + _ + - + - + - + _ + _ + - + - + - + - + - + _ + - + - + - + - + - + - + - + - + _ +

其中,前32比特是标准的,VLAN标签暂时定义为0x0203,需要向互耳关网号码分配4又威组织(Internet Assigned Numbers Authority ,筒称"IANA") 申请;后32比特中,只有12比特有用,表明VLAN标签的值,范围是0-4095; 其它比特预留。 Wherein the first 32 bits are standard, VLAN tag is temporarily defined as 0x0203, need to allocate 4 and K organizations to cross ears close network number (Internet Assigned Numbers Authority, the cartridge called "IANA") applications; 32 bits, only 12 bits Useful, VLAN tag value indicative of the range is 0-4095; other reserved bits. VLAN Label TLV在标签映射消息中使用,向上游分配VLAN标签。 VLAN Label TLV in the label mapping message, allocate a VLAN tag upstream. 本发明的一个较佳实施例中,为了和邻居设备协商VLAN标签,采用 A preferred embodiment of the present invention, in order to negotiate a VLAN tag and the neighbor device using

VLAN标签的设备需要通知邻居设备,本设备采用VLAN标签并要求邻居设备在分配标签时给本设备分配VLAN标签。 VLAN tag apparatus needs to notify the neighboring devices, the device uses a VLAN tag and requests a neighboring device in the allocation of the label to assign a VLAN tag of the present apparatus. 在LDP初始化消息中,需要通知邻居设备自己是一个动态QinQ交换设备,从而为自己分配VLAN标签。 In the LDP initialization message, the device needs to notify neighbors that he is a dynamic QinQ switching device to dispense VLAN tag for themselves. 需要增加一种可选参数,称为VLAN会话参数。 We need to add an optional parameter called VLAN session parameters. 其TLV定义如下: TLV which is defined as follows:

Type 0x0503 Type 0x0503

Length 8 bytes Length 8 bytes

Value 见如下定义 See Value is defined as follows

其中Value定义如下: Wherein Value is defined as follows:

0 12 3 0123

01234567890123456789012345678901 01234567890123456789012345678901

+—+—+-+—+—+—+-+—+—+—+—+—+_十_+—+—+—+—+_+—+—+—+_+_+—+_+—+_+_+—+—+_+ + - + - + - + - + - + - + - + - + - + - + - + - + _ ten _ + - + - + - + - + _ + - + - + - + _ + _ + - + _ + - + _ + _ + - + - + _ +

|0|0| VLAN Sess Parms (0x0503) | Length i | 0 | 0 | VLAN Sess Parms (0x0503) | Length i

+—+—+—+—+—+_+—+—+—+—+—+—+—+—+—+_+—+—+—+_+—+—+—+—+—+—+—+—+—+—+—+_+ + - + - + - + - + - + _ + - + - + - + - + - + - + - + - + - + _ + - + - + - + _ + - + - + - + - + - + - + - + - + - + - + - + _ +

I Reserved | Minimum VLAN | Maximum VLAN | I Reserved | Minimum VLAN | Maximum VLAN |

+_+—+—+_+—+_+_+—+—+—+—+—+—+_+—+—+—+—+_+—+—+_+_+—+—+_+_+_+—+—+—+_+ + _ + - + - + _ + - + _ + _ + - + - + - + - + - + - + _ + - + - + - + - + _ + - + - + _ + _ + - + - + _ + _ + _ + - + - + - + _ +

一般情况下,要预留一些VLAN做特殊用途,因此定义了VLAN的范围。 In general, the VLAN to reserve some for special purposes, thus defining the scope of the VLAN. 初始化后,向邻居分配标签时,就会分配定义范围内的VLAN 了。 After initialization, when assigning labels to the neighbors, it will assign a VLAN within a defined range.

在本发明的一个较佳实施例中,修改RSVP-TE的标签分配部分,而流量工程部分可以完全继承,无需修改。 In one embodiment of the present invention, in preferred embodiments, modify the label dispensing portion of the RSVP-TE, the traffic engineering section will be inherited without modification.

对标签分配的修改要求同LDP是一样的,分配VLAN标签以及协商VLAN标签范围。 Modification of the tag assigned to the same requirements as the LDP is assigned VLAN tag and label negotiation range VLAN.

协商VLAN标签范围通过PATH消息中的标签请求对象(Label Request Obj ect )来完成。 VLAN label request object range negotiation by the PATH message label (Label Request Obj ect) to complete. 在本发明的一个较佳实施例中,增加一种Label Request Obj ect 类型,称为VLAN Label Request,格式如下: In one embodiment of the present invention, in preferred embodiments, to add a Label Request Obj ect type called VLAN Label Request, formatted as follows:

Class =19, C-Type = 4 Class = 19, C-Type = 4

180 12 3 01234567890123456789012345678901 +—+_+—+—+—+—+—+—+—+_+—+—+_+—+—+—+_+-+—+—+_+—+_+—+_+_+—+—+—+_+_+—+ 180123 01234567890123456789012345678901 + - + _ + - + - + - + - + - + - + - + _ + - + - + _ + - + - + - + _ + - + - + - + _ + - + _ + - + _ + _ + - + - + - + _ + _ + - +

1 Reserved | LSPID | +-+—+—+-+—+—+—+—+_+_+-+_+—+—+—+—+—+-+—+-+-+-+—+-+—+-+-+—+—+—+—+-+ 1 Reserved | LSPID | + - + - + - + - + - + - + - + - + _ + _ + - + _ + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - +

I Reserved | Minimum VLAN | Maximum VLAN | I Reserved | Minimum VLAN | Maximum VLAN |

+—+—+—+_+_+—+—+_+_+—+—+—+_+_+—+—+—+—+_+_+_+—+—+—+-+_+_+—+—+—+—+_+ + - + - + - + _ + _ + - + - + _ + _ + - + - + - + _ + _ + - + - + - + - + _ + _ + _ + - + - + - + - + _ + _ + - + - + - + - + _ +

上游向下游申明其支持的VLAN范围后,下游就会通过RESV消息分配这个范围内的VLAN标签给它。 VLAN range is declared, the upstream support to downstream, the downstream VLAN tag is allocated to it in this range through the RESV message.

在本发明的一个较佳实施例中,实现VLL时,可以采用隧道复用机制, 这时候需要两层标签,Tunnel标签和VC标签,其中VC标签是出口PE分配给入口PE的,这一工作可采用LDP来完成。 In one preferred embodiment of the present invention, to achieve VLL, a tunnel multiplexing mechanism may be employed, which requires two time tags, Tunnel VC label, and the label, wherein the VC label is assigned to the egress PE ingress PE, this work LDP can be accomplished. 在本发明的一个较佳实施例中, 采用QinQ来实现两层标签,VC标签的格式为VLAN标签,这个VLAN标签由LDP分配,扩展方式如上所述。 In one embodiment of the present invention, in preferred embodiments, be implemented using QinQ double labels VC label format for VLAN tag, the VLAN tag allocated by the LDP, extended mode as described above.

采用上述的方案即可实现VLL。 VLL can be achieved using the above scheme.

虽然通过参照本发明的某些优选实施例,已经对本发明进行了图示和描述,但本领域的普通技术人员应该明白,可以在形式上和细节上对其作各种各样的改变,而不偏离所附权利要求书所限定的本发明的精神和范围。 Although embodiments of the present invention by reference to certain preferred, the invention has been illustrated and described, those of ordinary skill in the art should understand that various changes may be made thereto in form and details the appended claims without departing from the spirit and scope of the invention defined in the appended.

Claims (10)

1. 一种实现虚拟租用线的方法,其特征在于,包含以下步骤:A利用虚拟局域网双标签技术实现虚拟局域网标签栈;B使动态虚拟局域网双标签交换设备和多协议标签交换设备实现互通;C扩展标签分配协议以分发虚拟局域网标签并作为二层虚拟专用网的拓扑发现协议;D扩展资源预留协议-流量工程分配虚拟局域网标签并协商虚拟局域网标签范围;E构造虚拟局域网交换路径实现虚拟租用线。 1. A method for the realization of a virtual leased line, characterized in that it comprises the following steps: A ditag using a virtual local area network VLAN tag technology stack; B ditag of the dynamic virtual local area network switching equipment and multi-protocol label switching device can communicate; C extended label distribution protocol to distribute VLAN tags as topology discovery protocol layer 2 virtual private network; D expansion resource reservation protocol - traffic Engineering assign VLAN tags and consultation VLAN tags range; E to construct a virtual local area network switching virtual path leased lines.
2.根据权利要求1所述的实现虚拟租用线的方法,其特征在于,从不 2. The method of implementing a virtual leased line according to claim 1, characterized in that the never
3. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,当所述标签栈大于等于两层时,最外层的两层标签采用虚拟局域网双标签格式, 其余标签采用多协议标签交换设备的标签格式。 3. The method of implementing the virtual leased line as claimed in claim 1, wherein, when the label stack of two or greater, the outermost layers double VLAN tag label format employed, the remaining Multiprotocol Label label switching label format device.
4. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,所述步骤B还包含如下子步骤:Bl当所述动态虚拟局域网双标签交换设备位于上游时,在所述动态虚拟局域网双标签交换设备出接口上完成从虚拟局域网双标签封装到多协议标签交换封装的转换;B2当所述动态虚拟局域网双标签交换设备位于下游时,不改动上游多交换设备分配一个范围和虚拟局域网标签相同的普通多协议标签交换标签,在所述动态虚拟局域网双标签交换设备入接口上识别多协议标签交换标签并作为虚拟局域网标签处理。 4. The method of implementing a virtual leased line according to claim 1, wherein said step B further comprises the substeps of: Bl dynamic virtual local area network when the switching device is in the ditag upstream of the dynamic virtual ditag LAN interface on the switching device from the package VLAN ditag conversion MPLS encapsulation; B2 dynamic virtual local area network when the switching device is in the ditag downstream, upstream not change a multi-range switching device allocation and virtual the same local area network tag ordinary multiprotocol label switching label switching virtual local area network device into the ditag multiprotocol label switching interface identification tag and VLAN tag as said dynamic process.
5. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,所述步骤B还包含如下子步骤:Bl当所述动态虚拟局域网双标签交换设备位于上游时,在所述动态虚拟局域网双标签交换设备出接口上完成从虚拟局域网双标签封装到多协议标签交换封装的转换;议标签交换设备,所述上游多协议标签交换设备支持虚拟局域网双标签封装,所述动态虚拟局域网双标签交换设备给上游多协议标签交换设备分配虚拟局域网标签。 5. The method of implementing a virtual leased line according to claim 1, wherein said step B further comprises the substeps of: Bl dynamic virtual local area network when the switching device is in the ditag upstream of the dynamic virtual ditag complete LAN switching device from a virtual local area network interface package ditag conversion MPLS encapsulated; proposed label switching apparatus, the upstream device supports multi-protocol label switching VLAN ditag package, the dynamic virtual local area network bis label switching equipment to the upstream multiprotocol label switching devices are assigned VLAN tags.
6. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,所述步骤C中定义虚拟局域网标签类型长度值在标签映射消息中使用,向上游设备分配虚拟局域网标签。 The realization of the method of claim 1 virtual leased line, wherein the step C is defined VLAN tag type length value used in the label mapping message, the VLAN tag assigned to the upstream device.
7. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,所述步骤C中定义虚拟局域网会话参数和邻居设备协商虛拟局域网标签。 The realization of the method of claim 1 virtual leased line, wherein the step C is defined virtual local area network device negotiates session parameters and the neighbor VLAN tag.
8. 根据权利要求7所述的实现虚拟租用线的方法,其特征在于,在标签分配协议初始化消息中,所述动态虚拟局域网双标签交换设备利用所述虚拟局域网会话参数通知邻居设备自己是一个动态虛拟局域网双标签交换设备。 8. The method of implementing a virtual leased line according to claim 7, wherein, in the label allocation protocol initialization message, the ditag using dynamic virtual local area network VLAN switching device the session parameter notification device itself is a neighbor dynamic VLAN double label switching equipment.
9. 根据权利要求7所述的实现虚拟租用线的方法,其特征在于,标签分配协议初始化后,向邻居设备分配标签时,分配定义范围内的虛拟局域网标签值。 9. The method of implementing the virtual leased line according to claim 7, wherein the label distribution protocol initialization, when the neighboring devices to assign a label, the label value assigned virtual local area network within a defined range.
10. 根据权利要求1所述的实现虚拟租用线的方法,其特征在于,所述步骤D中通过在资源预留协议-流量工程的路径消息中增加虚拟局域网标签请求对象协商虚拟局域网标签范围。 10. The method of implementing the virtual leased line as claimed in claim 1, wherein said resource reservation protocol in Step D by - increasing the VLAN tag VLAN tag negotiation request object area Path message traffic engineering.
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CN 200410004119 CN100505746C (en) 2004-02-07 2004-02-07 Method for implement virtual leased line
PCT/CN2005/000120 WO2005078994A1 (en) 2004-02-07 2005-01-28 A method for implementing the virtual leased line
EP20050700492 EP1713197B1 (en) 2004-02-07 2005-01-28 A method for implementing the virtual leased line
DE200560008378 DE602005008378D1 (en) 2004-02-07 2005-01-28 Method for implementing the virtuely layered line
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